amilgake lusuardi and aristide palco



(No Model.)

A. LUSUARDI 8a A. FALCO.

REGISTERING MANOMETER No. 426,029. Patented Apr. 22, 1890.

UNITED STATES PATENT OFFICE.

.- AMILOARE LUSUARDI AND ARISTIDE FALCO, OF TURIN, ITALY.

REGISTERING- MANOMETER.

SPECIFICATION forming part of Letters Patent No. 426,029, dated. April 22, 1890.

Application filed January 11, 1890.

To all whom, it may concern.-

Be it known that we, AMILCARE LUSUARDI and ARISTIDE FALOO, both subjects of the King of Italy, residing in Turin, Italy, have invented certain Improvements in Registering-Manometers, of which the following is a specification.

Our invention relates to manometers, gages, and the like; and the object of our invention is to provide any of the known forms of manometers and gages with means for registering the pressure indicated above a predetermined point and to preserve a record of the sum of the excessive pressures, all as will be hereinafter explained.

In the accompanying drawings, wherein we have shown our invention embodied in a wellknown form of manometer, Figure 1 is a rear View of the manometer as it appears with the back plate of the casing removed and a part of the inner frame broken away. Fig. 2 is a Vertical section taken substantially along the line 2 2 in Fig. 1. Fig. 3 is a rear elevation of the manometer, showing only parts that are concealed in Fig. 1. Fig. l is a face view of the manometer.

In the box or casing A are seen the manoinetric tube B, which aetuates by the usual or any known means the needle 0, which indicates the pressure on a graduated numeralbearing plate or dial J. These features are all well known and form the usual elements of a manometer.

The object of our invention is to combine with the manometer shown or with some known form of manometer having a moving needle a device for registering and addin together overpressures.

This device we will now describe. The needle 0 is pivoted at C and has an arm 0, which moves with it. When the needle has been moved to a certain point on the dial designating the predetermined pressure, the end of the arm 0' impinges against the pendent end of apawl-lever D, which swings on an arbor D in the casing and swings said lever on said arbor, the lever swinging or moving with the needle. A spring-pawl F, carried by the upper end of lever D, engages the teeth of a ratchet-wheel E, fixed on the arbor D and through this means the said arbor is retated or turned to some extent about its axis.

Serial No. 836,626. (No model.)

On the arbor D is also fixed a disk E, on the face of which are numerals, which are made to appear successively at a sight-aperture I in the plate or dial J when the said disk is retated. As the pressure or tension diminishes and the needle 0 withdraws a spring D, mounted on the lever D, returns the latter to its normal position-that is, with its upper end bearing on or againsta stop-pin II. The free end of spring 1) bears on the opposite side of said pin from that against which the lever bears. This pin is mounted adjustably in a slot H in the frame A within the easing A. The lower part of this frame A is broken away in Fig. 1. The pin Il may be adjusted or set at any desired point along the slot II, and this adjustment governs the point at which the arm on the needle C will begin to act on the lever D, and it thus enables the predetermined limit of pressure to be fixed at will. A spring G prevents back ward rotation of the wheel E when the pawl F is retracted. \Ve have said that the arm 0 strikes the lower or pendent end of the lever D, and it may be arranged to do so; but we prefer to set a pin D in a slot in the lower part of said lever D for the arm 0 to impinge against. This construction permits the point where the said arm is to strike to be nicely regulated in constructing the de vice.

The operation is as follows: Suppose the predetermined limit of pressure is twenty pounds. The pawl-lever D is so set by the adjustment of the pin or stud II along the slot ll that when the needle 0 indicates or points to numeral 20 on dial .1 the arm 0 on the needle will just touch the pin or stud D on the lever D. Now, if the pressure be allowed to rise above twenty pounds the needle will move on and its operating-arm C will turn the ratchet-wheel E and disk E through the medium of said lever D and its pawl F. When the pressure falls, the needle will re turn, but the excess of pressure over twenty pounds will be registered by the disk E, which does not turn backward. The next time the pressure rises above twenty pounds the disk IE will again be turned, and this excess of pressure will be added to that before registered, and the sum will appear in numerals at the sight-apcrature I.

For increasing the capacity of the registering device means may be provided whereby when the disk E shall have turned once on its axis another disk, bearing a second series of numerals on its face, will be turned part way around, asin the case of gas-meter registers and the like. lVe have embodied such a device in our apparatus, and will now describe it with especial reference to Fig.

011 the arbor D is fixed a snail-cam L, which bears on or against a projecting toe M on a spring-pawl M. The nose M of this pawl engages ratchet-teeth on the edge of a disk N, rotatively mounted on the frame insidethe casing. .Each rotation of the arbor D causes the cam L to push back the spring-pawl M until its nose M rides over and engages behind a tooth of the disk N, and when the cam passes the toe M the springpawl M advances or rotates the disk N to the extent of one tooth. A spring-pawl 0 prevents back rotation of said disk. The numerals on the face of the disk N appear in succession at a sight-aperture P, as seen in Fig. 4. The numeral appearing at the aperture P indicates the number of times the disk E has turned or rotated on its axis. If the sight-aperture P be below the dial J and therefore not covered by the glass Q, it may be covered by a locked plate or wicket P to prevent any one from tampering with the mechanism. This feature is illustrated in Figs. 2 and 4..

We have shown but one embodiment of our invention; but it will be obvious that it may be adapted by anyone moderately skilled in the art to any form of manometer or pressure gage having a moving pointer or needle without departing in the least from the principles of our invention.

e have not deemed it necessary to show our invention adapted to every form of manometer.

Having thus described our invention, we claim-= 1. The combination, with the needle of a manometer or pressure-gage, said needle being provided with a registor-operating arm, of the pawl-lever D, some part of which is in the path traversed by said arm, a pawl F, carried by said lever, a rotatively-mounted ratchetwheel E, engaged by said pawl, and a disk E, fixed to the same arbor with said Wheel E, said disk bearing on its face a series of numerals adapted to be brought in succession before a sight-aperture, substantially as set forth.

2. The combination, with the casing and frame of a manometer or pressure-gage and the needle thereof, said needle having a register-operating arm, of the pawl-lever D, its pawl F, aratchet-wheel E, rotatively mounted in the casin g and engaged by the pawl F, the adjustable stop H of the lever D, and a retracting-spring which brings said lever back to said stop, some part of the lever D being arranged in the path of the operating-arm of the needle, substantially as and for the purposes set forth.

3. The combination, with the needle of a manometer or pressure-gage provided with a register-operating arm, of the pawl-lever D, actuated by said arm, the arbor D the ratchet-wheel E on said arbor, the pawl F on lever D, engaging said ratchet-wheel, the disk E and cam L on said arbor D the springpawl M, actuated by said cam L, and the toothed disk N, actuated by said pawl M, said disk N having a series of numerals on its face adapted to be brought in succession before a sight-aperture in the casing, substantially as set forth.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

AMILOARE LUSUARDI. ARISTIDE FALCO. \Vitnesses:

GIUsEPPE MAnIo MAZZELLI', SnooNno ,Cmrro. 

